I have replaced all the engine belts because the engine belt light came on. The light is still on, do I need to replace the belt tension sensor. Should I get a new one or can I get a used one. 964/1989 porsche carrera c4 3.6

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: Fan Belt Replacement - 911 (1965-89) - 930 Turbo (1975-89)

Is the switch depressed with the new belts installed? Check the see if it needs to be adjusted before replacing it. Especially if it wasn't on earlier.

- Nick

The belt sensor is actually a sensor for a broken belt. If both belts are still intact there is something wrong with the microswitch inside the belt sensor.
You should get a new one because you'll never know how long a used one has been on the previous car. Or just jumper the connector and replace the belts regularly like every 2-3 years for street use. Older 911 don't have them.

no adjustment on the sensor. must be a bad sensor. bridge the terminals in the plug and see if the light goes out.

maybe it was seatbelts?

Sensor issue.